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Title: Effect of alkali metal hydroxides on the morphological development and optical properties of ceria nanocubes under hydrothermal conditions
Authors: Kepenekçi, Özlem
Eanes, Mehtap
Demir, Mustafa Mustafa
Keywords: Ceria
Crystal growth
Growth kinetics
Issue Date: 1-Apr-2011
Publisher: American Scientific Publishers
Source: Kepenekçi, Ö., Emirdağ-Eanes, M., & Demir, Mustafa M. (2011). Effect of alkali metal hydroxides on the morphological development and optical properties of ceria nanocubes under hydrothermal conditions. Journal of Nanoscience and Nanotechnology, 11(4), 3565-3577(13).
Abstract: Nanocrystalline cerium(IV) oxide (CeO2, ceriaceria) particles were produced via the hydrothermal treatment of cerium nitrate hexahydrate with various alkali metal hydroxides (MOH: M = Li, Na, K). Experimental conditions such as [MOH], reaction temperature, and reaction time were studied. Particle morphology as well as size of crystallites was precisely controlled by choice of experimental conditions. While rod-shaped particles were obtained at 120 C, well-defined nanocubes were formed at higher temperatures regardless of the choice of MOH. Examination of particle growth kinetics, in the final stages of crystallization, showed that particle growth rate is controlled by two different mechanisms. Grain boundary diffusion controls the particle growth in the presence of NaOH with an activation energy of 113.8 kj/mol and surface diffusion for LiOH ad KOH with the activation energy of 43.0–150.9 kj/mol, respectively. In addition, the particles exhibit strong violet and blue emissions at 400 nm and 370 nm. The former emission originates from excitation of a wide band gap of CeO2. The latter one is attributed to the trivalency of the cerium ion and appears to be sensitive to all the experimental conditions studied. Both extending reaction time and increasing temperature reduce the intensity of the 370 nm emission and increase the intensity of the 400 nm emission.
ISSN: 1533-4899
Appears in Collections:Chemistry / Kimya
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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